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Edexcel IGCSE Math A 1.7.C Proportional Reasoning

Practise finding unit values, scale factors and missing quantities in cost, population, mixture and ratio contexts.

Syllabus
First assessment 2018
Course
Math A 4MA1
Level
Foundation

Exam points

  • find a unit amount before scaling to the required number of items
  • set up a multiplier or division when one population or quantity is a fraction of another
  • use ratio parts and the total volume to calculate a missing mixture quantity

1.7.C The process of proportionality to evaluate unknown question 1

[Maximum number: 2]

Jess makes salad dressing by mixing lemon juice and olive oil in the ratio 2: 5 by volume. She uses 0.5 litres of lemon juice.

Work out how much olive oil she uses to make the salad dressing.
litres

Tiesto wants to make 630 millilitres of the salad dressing. He mixes lemon juice and olive oil in the ratio 2: 5 by volume.

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